* {
    margin: 0;
    margin: 0;
}

.home {
    width: 800px;
    height: 400px;
    margin: 0 auto;
    display: flex;
}

.box {
    width: 400px;
    margin: 0 auto;
    background-color: #ddd;
    z-index: 999;
}

.pos_box {
    width: 100%;
    height: 400px;
    background-color: #ddd;
}

.click_box {
    width: 400px;
    height: 400px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.btn {
    width: 100%;
    height: 40px;
    line-height: 40px;
    text-align: center;
    background-color: rgb(0, 155, 0);
    cursor: pointer;
}

.btn:hover {
    color: white;
    background-color: rgb(0, 255, 0);
}

.inf_box {
    width: 100%;
    height: 40px;
    line-height: 40px;
    text-align: center;
    background-color: rgb(255, 255, 0);
}

.inf {
    color: red;
    font-weight: bold;
}

.sel {
    width: 100%;
    height: 100%;
    display: none;
    z-index: 9;
    position: relative;
}

#fn4:hover .sel {
    display: block;
}
